Electric vehicle and vehicle-mounted charger, and method for controlling the same

Abstract

The present disclosure provides an electric vehicle, a vehicle-mounted charger and a method for controlling the same. The method includes: obtaining a first total charging time for controlling the H bridge in a first manner and a second total charging time for controlling the H bridge in a second manner; obtaining a first predetermined charging time for controlling the H bridge in the first manner and a second predetermined charging time for controlling the H bridge in the second manner; selecting a manner according to a relation between the first total charging time and the second total charging time; and performing an alternate control on the H bridge in the first manner or the second manner according to the first predetermined charging time and the second predetermined charging time.

1 . A method for controlling a vehicle-mounted charger of an electric vehicle, comprising:
 obtaining a first total charging time (TA) for controlling an H bridge of the vehicle-mounted charger in a first manner and a second total charging time (TB) for controlling the H bridge in a second manner, when the vehicle-mounted charger starts to charge a power battery;   obtaining a first predetermined charging time (Tx) for controlling the H bridge in the first manner and a second predetermined charging time (Ty) for controlling the H bridge in the second manner;   selecting a manner for controlling the H bridge according to a relation between the first total charging time (TA) and the second total charging time (TB); and   performing an alternate control on the H bridge in the first manner or the second manner according to the first predetermined charging time (Tx) and the second predetermined charging time (Ty) to perform a temperature balanced control over a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor, in the H bridge,   wherein the first predetermined charging time (Tx) and the second predetermined charging time (Ty) are preset for each charging cycle of a charging process of the power battery.   
     
     
         2 . The method according to  claim 1 , wherein selecting the manner for controlling the H bridge according to a relation between the first total charging time (TA) and the second total charging time (TB) comprises:
 selecting the manner from the first manner and the second manner for controlling the H bridge according to the relation between the first total charging time (TA) and the second total charging time (TB); and   controlling the H bridge in the selected manner, until the first total charging time (TA) is equal to the second total charging time (TB).   
     
     
         3 . The method according to  claim 1  or  2 , wherein selecting the manner from the first manner and the second manner for controlling the H bridge according to the relation between the first total charging time (TA) and the second total charging time (TB) comprises:
 selecting the second manner for controlling the H bridge when the first total charging time (TA) is larger than the second total charging time (TB); 
 selecting the first manner for controlling the H bridge when the first total charging time (TA) is less than the second total charging time (TB); and 
 selecting the first manner or the second manner for controlling the H bridge when the first total charging time (TA) is equal to the second total charging time (TB). 
 
     
     
         4 . The method according to  claim 3 , wherein controlling the H bridge in the first manner comprises:
 when a power grid transient voltage value supplied to the vehicle-mounted charger is larger than 0, controlling the first switch transistor to be ON, controlling the second switch transistor to be OFF, and controlling the third switch transistor and the fourth switch transistor to be ON and OFF alternately and complementarily; and   when the power grid transient voltage value supplied to the vehicle-mounted charger is smaller than 0, controlling the third switch transistor to be ON, controlling the fourth switch transistor to be OFF, and controlling the first switch transistor and the second switch transistor to be ON and OFF alternately and complementarily.   
     
     
         5 . The method according to  claim 3 , wherein controlling the H bridge in the second manner comprises:
 when a power grid transient voltage value supplied to the vehicle-mounted charger is larger than 0, controlling the second switch transistor to be ON, controlling the first switch transistor to be OFF, and controlling the third switch transistor and the fourth switch transistor to be ON and OFF alternately and complementarily; and   when the power grid transient voltage value supplied to the vehicle-mounted charger is smaller than 0, controlling the fourth switch transistor to be ON, controlling the third switch transistor to be OFF, and controlling the first switch transistor and the second switch transistor to be ON and OFF alternately and complementarily.   
     
     
         6 . The method according to  claim 5 , wherein performing the alternate control on the H bridge in the first manner or the second manner according to the first predetermined charging time (Tx) and the second predetermined charging time (Ty) comprises:
 controlling the H bridge in the first manner until a time of controlling the H bridge in the first manner reaches the first predetermined charging time (Tx) and controlling the H bridge in the second manner until a time of controlling the H bridge in the second manner reaches the second predetermined charging time (Ty); or   controlling the H bridge in the second manner until a time of controlling the H bridge in the second manner reaches the second predetermined charging time (Ty) and controlling the H bridge in the first manner until a time of controlling the H bridge in the first manner reaches the first predetermined charging time (Tx).   
     
     
         7 . The method according to  claim 6 , wherein the first predetermined charging time (Tx) is equal to the second predetermined charging time (Ty). 
     
     
         8 . A vehicle-mounted charger of an electric vehicle, comprising:
 an H bridge, comprising a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor; and   a controller, configured to obtain a first total charging time (TA) for controlling the H bridge in a first manner and a second total charging time (TB) for controlling the H bridge in a second manner when the vehicle-mounted charger starts to charge a power battery; to obtain a first predetermined charging time (Tx) for controlling the H bridge in the first manner and a second predetermined charging time (Ty) for controlling the H bridge in the second manner; to select a manner for controlling the H bridge according to a relation between the first total charging time (TA) and the second total charging time (TB); and to perform an alternate control on the H bridge in the first manner or the second manner according to the first predetermined charging time (Tx) and the second predetermined charging time (Ty) to perform a temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor,   wherein the first predetermined charging time (Tx) and the second predetermined charging time (Ty) are preset for each charging cycle of a charging process of the power battery.   
     
     
         9 . The vehicle-mounted charger according to  claim 8 , wherein the controller is configured to:
 select the manner from the first manner and the second manner for controlling the H bridge according to the relation between the first total charging time (TA) and the second total charging time (TB); and   control the H bridge in the selected manner, until the first total charging time (TA) is equal to the second total charging time (TB).   
     
     
         10 . The vehicle-mounted charger according to  claim 9 , wherein the controller is further configured to:
 select the second manner for controlling the H bridge when the first total charging time (TA) is larger than the second total charging time (TB);   select the first manner for controlling the H bridge when the first total charging time (TA) is less than the second total charging time (TB); and   select the first manner or the second manner for controlling the H bridge when the first total charging time (TA) is equal to the second total charging time (TB).   
     
     
         11 . The vehicle-mounted charger according to  claim 10 , wherein the controller is further configured to:
 control the first switch transistor to be ON, the second switch transistor to be OFF and the third switch transistor and the fourth switch transistor to be ON and OFF alternately and complementarily when a power grid transient voltage value supplied to the vehicle-mounted charger is larger than 0; and   control the third switch transistor to be ON, the fourth switch transistor to be OFF, and the first switch transistor and the second switch transistor to be ON and OFF alternately and complementarily when the power grid transient voltage value supplied to the vehicle-mounted charger is smaller than 0.   
     
     
         12 . The vehicle-mounted charger according to  claim 10 , wherein the controller is further configured to:
 control the second switch transistor to be ON, the first switch transistor to be OFF, and the third switch transistor and the fourth switch transistor to be ON and OFF alternately and complementarily when a power grid transient voltage value supplied to the vehicle-mounted charger is larger than 0;   control the fourth switch transistor to be ON, the third switch transistor to be OFF, and the first switch transistor and the second switch transistor to be ON and OFF alternately and complementarily when the power grid transient voltage value supplied to the vehicle-mounted charger is smaller than 0.   
     
     
         13 . The vehicle-mounted charger according to  claim 12 , wherein the controller is configured to:
 control the H bridge in the first manner until a time of controlling the H bridge in the first manner reaches the first predetermined charging time (Tx) and control the H bridge in the second manner until a time of controlling the H bridge in the second manner reaches the second predetermined charging time (Ty); or   control the H bridge in the second manner until a time of controlling the H bridge in the second manner reaches the second predetermined charging time (Ty) and control the H bridge in the first manner until a time of controlling the H bridge in the first manner reaches the first predetermined charging time (Tx).   
     
     
         14 . The vehicle-mounted charger according to  claim 13 , wherein the first predetermined charging time (Tx) is equal to the second predetermined charging time (Ty). 
     
     
         15 . An electric vehicle, comprising:
 a vehicle-mounted charger, comprising:
 an H bridge, comprising a first switch transistor, a second switch transistor, a third switch transistor and a fourth switch transistor; and 
 a controller, configured to obtain a first total charging time (TA) for controlling the H bridge in a first manner and a second total charging time (TB) for controlling the H bridge in a second manner when the vehicle-mounted charger starts to charge a power battery; to obtain a first predetermined charging time (Tx) for controlling the H bridge in the first manner and a second predetermined charging time (Ty) for controlling the H bridge in the second manner; to select a manner for controlling the H bridge according to a relation between the first total charging time (TA) and the second total charging time (TB); and to perform an alternate control on the H bridge in the first manner or the second manner according to the first predetermined charging time (Tx) and the second predetermined charging time (Ty) to perform a temperature balanced control over the first switch transistor, the second switch transistor, the third switch transistor and the fourth switch transistor, 
 wherein the first predetermined charging time (Tx) and the second predetermined charging time (Ty) are preset for each charging cycle of a charging process of the power battery. 
   
     
     
         16 . The electric vehicle according to  claim 15 , wherein the controller is configured to:
 select the manner from the first manner and the second manner for controlling the H bridge according to the relation between the first total charging time (TA) and the second total charging time (TB); and   control the H bridge in the selected manner, until the first total charging time (TA) is equal to the second total charging time (TB).   
     
     
         17 . The electric vehicle according to  claim 16 , wherein the controller is further configured to:
 select the second manner for controlling the H bridge when the first total charging time (TA) is larger than the second total charging time (TB);   select the first manner for controlling the H bridge when the first total charging time (TA) is less than the second total charging time (TB); and   select the first manner or the second manner for controlling the H bridge when the first total charging time (TA) is equal to the second total charging time (TB).